RT8062

2

DS8062-07

November 2012

www.richtek.com

©

Copyright

2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

COMP

Error Amplifier Compensation Point. The current comparator threshold increases

with this control voltage. Connect external compensation elements to this pin to

stabilize the control loop.

2,

9 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to GND

for maximum power dissipation.

3

EN

Enable Control Input. Float or connect this pin to logic high for enable. Connect to

GND for disable.

4

VIN

Power Input Supply. Decouple this pin to GND with a capacitor.

5, 6

LX

Internal Power MOSFET Switches Output. Connect these pins to the inductor

together.

7

RT

Oscillator Resistor Input. Connecting a resistor from this pin to GND sets the

switching frequency. If this pin is floating, the frequency will be set at 2MHz

internally.

8

FB

Feedback. Receives the feedback voltage from a resistive divider connected across

the output.

Typical Application Circuit

Note : Using all Ceramic Capacitors

3

EN

VIN

4

RT8062

2.7V to 5.5V

RT

7

LX

5, 6

COMP

FB

8

1

GND

2,

9 (Exposed Pad)

L

10µF

R1

R2

R1 (k

Ω)

R2 (k

Ω)

L (

μH)

3.3

75

24

33

560

2.0

22

2.5

51

24

22

560

2.0

22

1.8

30

24

15

560

1.5

22

1.5

21

24

13

560

1.5

22

1.2

12

24

11

560

1.5

22

1.0

6

24

8.2

560

1.5

22